Brake



Jan. 21, 1936. L, E, LA BR|E l 2,028,614

BRAKE Filed March 6, 1933 2 Sheets-Sheet 1 IN V EN TOR.

Lunge-.R ELA BRN?.

@P/ ml A TToRNEY Jan. 21, 1936. l E. LA BR|E 2,028,614

BRAKE Filed March e, 193s 2 sheets-sheet 2 INVENTOR. LUQYGER E LABmEATTORNEY in effect rigid parts of the shoes.

Patented Janv. 21, 19.36

UNITED STATES PATENT OFFICE BRAKE 'Ludger E. La Brie, South Bend, Ind.,

Bendix Aviation Corporation,

assignor to South Bend, Ind.,

This invention relates to brakes, and is illustrated as embodied in aninternal expanding anchored-shoe brake for an automobile. An object ofthe invention is to provide a simple and inexpensive brake which is ofconsiderable power, by

mounting the shoes in a novel manner so that.

they can adjust their positions automatically to the drum, whether ornot they are substantially worn.

Preferablythe shoes have frictionally pivoted in a novel manner thereonanchor links which can shift, on the application of substantial presesure, relatively to the shoes to give the desired self-adjusting actionbutwhich normally form The links are shown pivoted on a xed anchor postcarried by the backing plate and arranged betweenthe' ends of the shoes.

I prefer to arrange the links in'pairs, the links of each pair embracingbetween them the end of the shoe web, and which may be notchedat theirends for engagement with a pivot carried by the web. The links of eachpair are shown frictionally gripped to the web by a yieldinglyheldfastening carried by the links and shown passing through a largeclearance'opening in the shoe web, and preferably also through frictionwashers or the like arranged between the web and the two linksrespectively.

I consider it important to use, with the abovedescribed shoes, a fluidpressure applying .device (shown as including a hydraulic cylindercontaining freely-movable pistons acting on the shoes), or otherapplying device constructed and arranged to balance its pressures lonthe two shoes, vso that unequal self-adjustment of the two shoes willnot upset the balance -on the shoes of .the oppositely-directedbrake-applying pressures.

The adjustment 'of the brakeis facilitated by providing the shoes withadjustable stops, the illustrated form of which embodies certain novelstructures, andwhich can be tightened up while the brake is held appliedand then backed off to give the desired clearance for the shoes inreleased position.`

The above and other-objects and featuresA of` lthe invention will beapparent from the following description of the illustrative embodimentshown in the accompanying drawings, in which: Figure 1-- is a verticalsection throughthe brake, just inside the head of the brake drum, andshowing the brake shoes in side elevation;

Figure 2 is a partial section on theline 2-2 3, but showing an chorlinks;

Figure 3 is a partial sectionv on the line 3-3. of Figure 1, showing oneof the adjustable stops;

Figure 4 is a section corresponding to'Figure 5 alternative form ofstop; elevation, partly broken away of'Figure 1, showing the mounting ofthe an- Figure 5 is an in section to correspond to Figure 1, of a modi-Iied form of brake having some lof the advantages of the invention, butin which .only one of the shoes anchorsy through frictionally-piv-Figure 6 is a partial section o`n the line 6 6 Figure 5, showing thebrake anchorage; and

Figure 7- is a partial section on the line l`l l1li of' Figure 5,showing a shoe-positioning device. In the embodiment illustrated inFigures 1 to 4, the brake includes a rotatable drum I0 (preferablyprovided with a liner shell I2 welded therein and carrying a drumlining'M of cen- 20 trifugally cast iron), with a support suchl as abacking plate I6 which cooperates with the drumto form a substantiallyclosed brake chamber inclosing the friction means of the brake. In thearrangement shown, the backing plate terminates adjacent a flange I8 atthe mouth of the drum, forming a, close annular joint which is bridgedby the liner I2-f 4, and the liner is also preferably formed with abaille or rib 2U arranged just inside the outer ilange of the backingplate. i

The illustrated brake includes shoes 22 and 24, which may be T-shaped incross-section and, ifA desired, made byvwelding -a web to a rim carryingvthe brake lining.

The lower end of the web of each shoeis formed with an opening 26, justabove which is a transverse pivot 28. The latter is shown engaged bynotches in the ends of anchor links 30 arranged on opposite `-sidesofthe shoe web,,the links 30 40 of both shoes preferably being notched toengage and be pivoted at their other ends on an anchor post 32 vcarriedby the backing plate and arranged between the ends of the shoes. Aspring 34 holds the parts. together.

Links 3|),V for each of the shoes, have a fastening such as a transversepin 36 passing, with considerable clearance, through the correspondingopening 26, and preferably also through fric-` tion washers 38 arrangedbetween`the shoe web 50 and the respective links 30. Spring washers (orequivalent spring means) 4U are mounted on the end of each of thefastening's 36, and compressed between nuts threaded on the'end of thefasten ing and the side of the shoe web. Thus links includes a setscrew48 or the like, having arounded end engaging (when the brake isreleased) the inner face of the shoe rim. The setscrew 48 is threadedthrough a fitting 50 riveted in an inclined portion of the backingplate, and

preferably provided with a series of grooves or notches for engagementwith a spring-pressed locking ball 52 carried by the setscrew. Thesetscrew has at its outer end a notch to receive a screw driver.

In the alternative form shown in Figure 4, the

stop is in the form of an eccentric 55 having a stern extending throughthe backing plate and 'formed at its end to be grasped by a wrench, andnormally held in adjusted position by a lock-nut 58. In Figure 4, thebacking plate is shown with a peripheral cylindrical flange 60 ttingclosely inside of a peripheral cylindrical flange 62 on the drum,forming an annular joint bridged by the liner |2-|4 l The brake isadjusted most conveniently by holding it applied, tightening up thestops 48 (or 55) as far as possible, and then backing off suiciently togive the desired clearance.

- yIn the arrangement illustrated in Figures 5-7,

i a drum 10 'and backing plate 12 of a different type are shown;however, as in the previous modification they jointly form asubstantially closed brake chamber housing the friction means ofthebrake.

In this case, however, vthe drum is a casting' formed with peripheralheat-radiating and drumstiffening ribs 14, the ones nearer the open sideof the drum being deeper than those nearest the head of the drum exceptthat the one at the extreme edge of the braking flange is machined downto t closely inside an edge flange 16 formed on the backing plate andblocked off at its edge by the higher ribs 14 to form in effect a bafflepassage between the drum and backing plate.

In this case one ofthe shoes, being the reverse shoe 18 which is mosteffective when the .drum isv turning clockwise and the vehicle istherefore moving backward, is directly anchored on means' such as apivot orjanchorpost 80 carried by the backing plate.

The shoe.y is provided with suitable steady rests 82 of any desired fon., and its released position is determined by an adjustable stop suchas an eccentric v84 engaging the rim of the sh'oe. The eccentric 84 isiixedly mounted on a pivot 86 by engaging the head of which with awrench it can be turned from outside the backing plate,

and is frictionally held in adjusted position by a hydraulic cylindercoil spring 88 sleeved on the pivot and compressed between the eccentric84 and the backing plate 12.

The forward shoe 90, however, has at its lower end novel frictionallypivoted thrust or anchor links 92 or the like, preferably arranged onopposite sides of the shoe web, and shown mounted atvthei'r ends on theanchor post 80 on opposite sides of the web of the shoe` 18.

Links 92 may be connected to the web of the shoe 90 by means such as apivot 94 arranged betwen the ends of the links. The pivot 94 and anchor80 are shown provided at their ends with washers 9B and cotter pins 98.

The ends of the links 92 opposite the anchor post 80 are, in theillustrated arrangement, frictionally gripped to the shoe web by meansshown as including a tension part |00 passing through openings in thelinks 92 and a slightly larger opening in the shoe We Part |00 has arounded head engaging one link 92, and is riveted over at its other endto hold a washer or spring retainer |02. A coil spring `|04 encirclingpart |00is compressed between retainer |02 (which acts on the upper link92 through part |00) and the lower link 92, and frictionally grips thelinks to the shoe web.

While two illustrative embodiments have been described in detail, it isnot my intention to limit the scope of my invention to those particularembodiments, or otherwise than by the terms of the movement of the linksand the shoe but permit-4 Ating such movement of the linksupon the pivotupon theapplication of a substantial force.

2. A brake comprising a shoe with a web having an'opening at its end andwith a pivot a short distance from said end, a pairof anchor links onopposite side of said web and notched at their ends for pivotalengagement with said pivot, friction washers between the links and theopposite sides of said web, a fastening passingthrough the links andthrough said washers and through said opening, and a spring cooperatingwith the fastening and said washers and normally preventing relativemovement of the links and the shoe but permitting such Amovement of thelinks upon the i pivot uponthe application of a substantial force.

3. A brake comprising a backing plate having a portion inclined to thegeneral plane of said plate,

a shoe mounted on the plate, a setscrew adjust@ ably threaded throughsaid inclined portion of the plate and forming a stop engaging the rimof the shoe, and a spring-pressed Aball held from turning with thesetscrew and engaging grooves on said setscrew for yieldingly lockingthe setscrew in adjusted position.

v LUDGER E. LA BRIE.

